The utility function is U=x^2+y^2, the IC will be concave and a concave IC represents bad. Why does this utility function represent good commodities? - Quora
Various historical utility functions, all convex for losses and... | Download Scientific Diagram
The utility of money is a stairway to heaven
Submodular maximization of concave utility functions composed with a set-union operator with applications to maximal covering location problems | Mathematical Programming